Exterior housing for a mirror for a motor vehicle



FIG. 1 is a front perspective view of an exterior housing for a mirror for a motor vehicle showing my new design;

FIG. 2 is a right side elevational view;

FIG. 3 is a top perspective view;

FIG. 4 is a bottom perspective view; and,

FIG. 5 is a left side view.

The broken line showing of an attachment area and hardware are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a exterior housing for a mirror for a motor vehicle, as shown and described. 